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Duh, senior moment made me write Boyle in lieu of Pascale. Thanks for the correction. Your fresh water tank typically has an 1 1/2” corrugated tube over flow tube, that has no rise to it like the black tank vent. It also is a very short length. Neither is conducive to creating the back pressure the black tank does. As for lack of resistance to create the pressure, that is non sequiter. Close the black tank valve, climb up on top of the camper and place a garden hose end inside the waste vent opening. Turn the water on slowly, then come back the next day. Let’s see what happens. When I request a rough-in plumbing inspection, the inspector checks the 10’ water filled vent pipe to determine if the trenched in plumbing has no leaks. The 10’ of elevation produces 4.34 lbs of pressure at its base without the need of a pressurized water source. Filling your camper’s black tank via the vent pipe till water backs up and overflows, will prove my point nicely.
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